I don't there is a 5 or 10G rimless tanks unless you get one customized or you can order one that's rimless which isn't a 5 or 10G its a 7.5 rimless tank from Mr.aqua
Aquarium Village used to carry nice rimless tanks. I got one there about a year ago for $20(10 gal) . Its actually the only tank I have setup right now!
What you looking to spend? They have all in one setups that cost a bit more. I got a MR.aqua and drilled it to a sump, its a 7.5g and its 12x12x12 and i think thats the perfect nano siz tank. The deepblue with black silicone is also a nice rimless tank... But how are you looking to set up, do you have an idea??