Reddit mentions of bodylastics Combat Ready Warrior Resistance Band Sets Come with 6 or 8 Anti-Snap Exercise Tubes, Heavy Duty Components and a Small Anywhere Anchor (21 Pcs - 262 lbs, One Bag)

EDIT: I'm not trying to be a salesman. I spent enough money on bands to know what works best for me. Just sharing my experience so others don't have to buy mediocre bands they end up giving away or let slowly rot in a closet.

Bodylastics stopped selling their older lines on Amazon and now only sell their military themed "warrior edition" resistance band sets there. I find that interesting, seems like once they came out with the "warrior edition" everyone just stopped buying the plain ones.
Link: https://www.amazon.com/Bodylastics-Strong-Man-Warrior-System/dp/B006O0GDMO/

EDIT 2: Those bands I linked above went out of stock, a new batch came in, and I made another order on July 5th and there were 17 left. Now it's out of stock a few days later and this time a notice saying they don't know when they will be in stock again. Here is link to Bodylastics own website where they still have them in stock for the same price:
http://www.bodylastics.com/collections/tube-resistance-bands/products/bodylastics-warrior-resistance-bands-kit

Supposedly based on feedback by military and security personnel these new sets have natural 'camo-based colors' based on dark greens and various shades of brown/tan for the bands, the handles are black and OD green instead of blue and black, the carabiners and other metal hardware are coated black instead of being shiny raw stainless. Even comes in a camo bag. It seems to be mostly advertising but the colors do look much better to my eye than the older neon band color theme, the new bag is better than the old ones I have by a long shot and the new handles are textured whereas my old ones were a soft foam around an ABS cylinder.

You can save money and get the Black Mountain resistance bands, they are not as well made on the accessories and the bands don't have the good anti-snap Bodylastics copyrighted. Very few people have BM bands snap as long as you are sensible with them anyway and BM has much heavier 45-50lb bands available. After handling them both I'd say the Bodylastics is more for your money, the better handles, anchors, and the band barrier make it way better bang for your buck. If money is tight the BM bands will do in a pinch and are functional, I'd suggest anyone to spend $12 on a set of Bodylastics handles to use with your BM bands if you go that route.

For you working out on a ship you should be fine. Fits in a fairly small bag, not heavy, and you can get a good workout as long as you can get something like a ~5ftx5ft space near an anchor point. I've been in cramped conditions before. Actually can make it easier, lots of places to anchor the bands. The ankle straps I end up using as anchors occasionally, just wrap them around a solid leg of say a bunk bed or part of a metal storage rack. The larger Bodylastics set has a band barrier with it, those are $12 or so alone and that thing does it's job well. It allows you to wrap bands around rough stuff like timber posts or stand on them for curls and overhead presses without damaging the bands.

if you decide to buy some---i went with bodyelastic brand. There's a lot of cheap ones out there but I think it's worth spending a bit of money.

Resistance Bands. bodylastic has a great set of like 21 pcs and they are awesome. plus ofcourse your traditional bodyweight exercises.

http://www.amazon.com/Bodylastics-Resistance-components-membership-LIVEEXERCISE/dp/B006O0GDMO/ref=pd_sim_sbs_sg_5

resistance bands. https://www.amazon.com/Bodylastics-Strong-Man-Warrior-System/dp/B006O0GDMO/ref=sr_1_3?ie=UTF8&qid=1506396538&sr=8-3&keywords=resistance+bands+bodylastics

all i need is a door.

goal eventually is to build a garage, and in there will be a gym and mancave.

I sold my home gym and replaced it with this. Total replacement for your gym equipments. Got mine around 45$ awhile back I think. Don't be fooled, they have different tensions, check their other sets for even stronger resistance. Won't ever snap but if they ever do, they will replace it for you guaranteed free with a lifetime warranty. >4.5 stars Amazon rating.

And also maybe a pull-up bar. That's all you need.