I think that today's kits are overpriced considering that the kits offered tend to be out-of-date (AMT/ERTL kits are famous for this, their Ford Probe is still a kit you can buy at nearly 12 bucks a model); Tamiya is merely responding to the current oil prices by jacking their kit's prices, but what really irks me is that everyone complains about it.
I used to run a hobby shop and I'd hear that my prices were too high and that you could get them cheaper over the border -- well, kiddies, go over the border, but when you figure travel costs/rates of exchange into it, it's no cheaper.
Manufacturers complain that it costs over a million dollars per mold die -- it's true. However, after running off a half million kits, they sell them to other manufacturers at nearly the price they paid to have them made.
Polar Lights is a perfect example. Their Frankenstein kit, their Spock kit are from 1968; they've never cleaned up the molds and they still charge 30-50 dollars (retail for them).
Do what I do, exhaust every other possibility for locating them, or make your own.
Also, don't buy that kit from the Hobby Collector's magazine or the Modelers Price Guide. That's what gullible people pay for kits -- $6,500.00 for a AMT Star Trek Enterprise (no scale given) with the orange upper and lower 'glass' bubble? I built the original with the blue version and it was $6.00 back then! It hasn't changed in over 40 years.