Many LHBS will have really good condition corny kegs available. Well, the better ones do (like Jasper's
)... Factor in the shipping charges on getting them from a non-local source, then see what the LHBS charges for them. If the difference is only a couple/few dollars (with the LHBS being higher) talk with the manager/owner of the LHBS to see if they'll match the delivered cost on the kegs. I've found that the really good stores will either already be within a dollar of the online price (with, or without shipping) or will work with you on making you not feel graped on the deal. I'm not talking about prices from someone on CL, or great sale priced kegs, but normal keg pricing.