Pitbull Plecos are an awesome small plant safe Pleco !!
I would find homes for your two Commons now before they die or become stunted from trying to live in a 10g.
Big fish need big tanks even as babies so they can GROW healthy and strong
Commons are poop machines and need large tanks or a pond and need large filtration. They can live into their 20s.
You'll have to decide if you want to dedicate a huge tank for your Plecos. Plus as they grow, they may get territorial.
I like to give them wood and veggies. Zucchini, Cucumber, quality Algae wafers, etc... Feed them, don't assume all they need is algae on the walls.
I understand about wanting to see the fish before you buy it, but since Petco has a guarantee, ask ; if you order online, can you return to store ? IF the fish is sick or you don't like it.
Or check this site or The Planted Tank OR see if you have a local Aquarium or Fish Club ????
I went to a club meet and auction Saturday and Bristlenose Plecos Long Fin, Short Fin, Albino, Blue Eyed...all went for about $2-3 a fish, very cheap !