I totally understand where you're coming from. The only German kit I've got is an aging PZ IV J(?) from Dragon that I bought years ago...it was probably the last kit I actually bought in a store. I usually will only buy supplies from stores, and like you, my nearest store is 2 tolls and and hour and half away. The internet is where I buy, you just have to be careful. I've had really good luck at several online vendors and if you shop around you can get FAR better prices online (I'm sure you've also noticed that as more kits come out with better quality the price goes waaaay up. It was not long ago that the price ceiling was Dragon's MAZ-543 TEL w/Scud SS-1c kit. Tigers cost around 40-50, but now to buy a truck (granted its new and awesome) Trumpeter's LMTV, I've seen it retailing for 70-80! A TRUCK! I've got three on my workbench (my living room table...hehe) as well and I just want to keep the progress rolling. I find that this hobby is relaxing and mind numbing (a good thing to me) after a long day at work.
What I would recommend to you, before you get too burnt out; look through your stash, or reorganize it. Transer all the German stuff to the back of the pile so you don't have to see it. Build some odd stuff for a while. Or, find some people that you know and get the started in the hobby.
My on the German kits proliferation: people keep buying and wanting them. What does this mean for us? We'll get a new kit of almost every piece of German armor that was ever developed or dreamed of. I'm encouraged that most manufacturers are slowly dabbling or exploring new areas of the market
Tamiya and French Armor
Bronco and British/Italian Armor
Dragon and some of the others have been fairly consistent in slowly bringing out new Shermans, one or two each year.
If the trend was wanting to build cold war or modern war stuff, we'd be having the same conversation right about now. I'm just hoping that we get some new polish kits out there, or perhaps just a 'good' and accurate 7TP.
Don't feel bad about slowing down, I've had to quit for school several times, so since I've started modelling I"ve only been 'active' less than 50% of the time.