Can I get an iPhone 5 pay as you go on T-Mobile?

When I go on the T-Mobile website and search for a pay as you go phone, iPhone 5 doesn't come up. Does that mean I can't get an iphone 5 on t-mobile, or can i just get an unlocked one and a t-mobile sim?

I would say you can only get an unlocked one and then get a sim separately. It is a better idea as unlocked one sell better and for a higher price when you want to change your phone.