I know your question was not addressed at me but a 55 gallon tank itself is not very expensive. usually around 80-100$. The stand will run you a similar but slightly higher amount and then you have to think about filters lights heaters etc.
that's a lot cheaper than the ones where I live but then again there is only one REAL pet store and it's really small the other place is walmart which isn't too bad priced and the tanks are pretty good too, i'm trying to talk my wife into letting me get one, but since i'm always getting deployed she has to take care of them. so we'll see, hopefully in the near future I'll be able to afford one
if your trying to cut costs you could build it yourself
Silicone-100% pesticide/ algaecide/ fungicide free aquarium silicone II
Single Sided Razors
Felt Tipped Marker
Possible support braces for larger aquariums. 30G+
Check out about for specifics on building
I'm going to try to build a small tank soon... seems relatively simple and a lot of fun.
even though my tank was 75$ with stand and powerheads it is still going to cost a lot of money. I am spending $285 overall for everthing the lids, plants, decorations, etc... so if you want to start a new tank make sure to save up
still not bad as I spent almost 200 if not more when I got my grandpas tank and I didnt have to get a tank stand but I had to replace filter hood gravel all decorations more food man that was a killer in my walet :'(