I've never heard of that particular site but I have seen similar websites that offer amazing deals on aquarium items. However, those deals usually are too good to be true and you can read some horror stories on R2R about a few of them. Long story short, I'd avoid buying something like a tank from them. 180 is popular size and they come up for sale on a somewhat regular basis. If you're looking for something new, it's always best to get it locally or from a big name, reputable on line vendor for the support they can offer. Not only can they help you out with setup and questions but (more importantly) you'll have support for any warranty claims that you might have to make.
I was going to poke around on wish.com and see what some of the deals were but it required a login and I didn't want to give them any information just so I could poke around. However, I did see a banner and some of the deals really did look too good to be true.