Regretfully, I did the same thing with a mispriced Syn. angelicus years ago. That was before I knew better. An lfs has it hard enough nowadays without complicating things by ripping them off. They have to pay for rent/mortgage on the building, insurance, wages, foods, heavy utilities, advertising, taxes, business supplies/equipment, etc. Plus, have to deal with shorted orders, mortality rates, diseases, shop-lifting, ware damage, renovations/repairs, bad checks, DOA guarantees, cleaning materials, perishable losses/expiration dates, abandoned pets on the doorstep, security systems, inspections, etc.
Realistically, if you'd ordered that PB over the 'net, it would have cost at least the $40 list price once you include packageing and shipping costs. So, basically, you bought a PB that would have cost less than it would ordering on line PLUS, got the chance to inspect it before purchasing.
The lfs, and indeed any business, that is forced to withstand frequent losses will result in that store being forced to close its doors. If/When that happens, everyone locally will lose the convenience of 'seeing before buying' and having an avenue for purchasing emergency supplies when they're desperately needed to save the fish being cared for at home.