Hi Holly,
Sorry for the late reply. Yes, DIY tank can be cheaper.
For example, a 96X24X24 plywood tank costs about $650 give or take.
The same size tank at Glasscages (actually 96X24X25) costs $450 plus $80 charge when picking up from one of their show trucks.
But, $650 can also make you a 96X36X24 tank whereas Glasscages is $1100.00
Quite a jump.