A lot of money for an obsolete product

We're putting an addition on to our house, and I've opted to not wire it for data or phones.  I'm going to use cordless technologies instead. WiFi, of course, is cheap. And on the phone side, all I need is to get two additional wireless extensions for my Siemens 8825 two-line phone system. It's not a great system, but I'm invested in it, with one base station and four extensions already distributed around the house.

But there's a problem: the phone is no longer being made, and the extensions, which were hardly cheap when I got the system years ago, are now selling at inflated black-market prices on eBay. I just lost an auction for two handsets, where I grudgingly bid $110 each. Buy-It-Now prices are $129 to $149, and it sells for $350 at online stores. This is robbery.

I'd like to dump the system and start over, except getting a high-quality six-extension two-line wireless system is expensive now matter you slice it, especially since if I'm going to upgrade, I'd like to get a 5.8GHz system, and there are only a few models available. So I think I'm stuck paying these usurious prices for a product I don't really like to begin with.

End of rant.