I usually get mine from eBay - and they usually arrive within a week. There are both commercial sellers, and some private ones who genuinely no longer need their strips (e.g. ex-gestational diabetic mums, or people who've changed meters and have remaining strips).
Bought mine on eBay but they are now on sale from bayer. I have to fund my own strips for this as doc says too expensive but you can get them on eBay too. You just have to be careful of dates etc