I've had students do something like add a pound of light DME to a light beer to give it a little more heft. You could add some crystal to each of, or both, kits. You'd wind up with slightly punchier, maltier, sweeter versions of the kits. I'd hesitate to do too much to the kits, though, since you don't know too much about what's in them, and just how sweet or hoppy they are.
If the goal is to make as much beer as possible, then you'd make the faux altbier, the blonde ale kit, and the pilsner kit. That would give you 11.5 gallons in three styles, with a little leftover hops and some leftover specialty grains for your next batch.
As for your LHBS, if you object to driving, you can order online. Austin Homebrew, Northern Brewer, Amazon.com, etc. If you plan three or four batches ahead, you can amortize the shipping costs down to a reasonable price. Restricts you to dry yeast some, but there are several good dry yeasts (like the Nottingham that you already have).