Fish Mongers

I am looking to replace an old-school 15 gallon high aquarium, with an tank that has the same footprint.

This leads to the following two options:

15 gallon high:  20"W x 10"L x 18"H, or

20 gallon extra high:  20"W x 10"L x 24"H    

Please feel free to reply or message me if you know where I might find one.

Thanks,

Tom