I read somewhere that the new strips were not compatible with the old machines. You may try calling Alere (I think that they may have a phone number on the back of the meter) and asking them about the situation with meters and strips. They may not want to sell strips, if any are available, but your doctor may be able to order them if they're not available to you.
It would be good to know the company's official answer to the supply shortage, to pricing, and to whether or not the new strips are compatible with the original meter.
(You may just take the InRatio problems as a sign that you may be better off with a different meter. Sometimes, you'll fall into a good deal on eBay that you may have to snatch up quickly, or you may find one that was poorly listed (misspelled title, or something) and that there's little competition to purchase. I just got a Hemochron Jr - a meter that few on this forum know about, and that is usually just used in medical facilities, for $50. This will be used for comparison with the blood draws, the Anticoagulation Clinic's Hemochron Jr, my Coag-Sense and, if I ever get more CoaguChek XS strips, occasional comparisons to the CoaguChek XS. Having had a TIA because I put blind faith in my meter, I want to be pretty confident that my INR IS in range when I test it. Keep looking on eBay, and you may get lucky.)
I ran through a lot of comparison tests between meters and labs last year, and made my own determination of which method to trust, and the direction of the meter's error. Once I add the Hemochron to my test regimen, I'll report on this, too. (Of course, this information may be of less value to most on the forum, because this meter is probably not an option like the CoaguChek XS and Coag-Sense are).