Another option, Steve....
First, while I like a peep for HD and deer hunting, it's not an absolute necessity,and I find it a handicap I don't need for wingshooting.
You may want to use the old Skeet shooter's trick and install a mid bead on your bbl.This costs only a few bucks and serves well as a read sight for fast shooting. The proper sight picture has the beads looking like a figure 8, and it's durable and fast.
This should serve you well until your cash flow improves and you can get a dedicated HD shotgun,which I personally recommend.
However, a reliable pump gun is a weapon of awesome capabilities in trained hands, so go for the expertise first and buy that ammo!!(G)...