lamotte chlorine dioxide test strips

what is going on with these Lamotte test strips?!!  I used to buy them from amazon, now it is either currently not available  or   double the price and the shipping is almost same price as the item!!  I used to buy them for around 11$ now they are almost doubled the price.. is there a shortage of strips?   could you recommend  another brand to use?  if so please put a link to where to buy these.. thanks

The price of many products has risen. LaMotte #3002 CLO2 test strips are the best I have found. 

I am just starting out and was sent a half used container of LaMotte test strips because the guy I got my CDS concentrate from said he could get anymore. I quickly went through those strips and realized they were expired the beginning of the year. So when I calculated that the CDS concentrate was not really the strength I was sold I guess the test strips might be falsely telling me that. I'm trying to save my cat with cancer and I overnighted another brand. But today I ordered some LaMotte on eBay because everyone says they are the best accuracy.. They were the best price I could find at 15.00 plus $5.00 shipping.