In my search for finding cheap stuff to save money, I came across this website: eraceware.com. They sell all sorts of stuff, but I was only interested in oil and air filters. I learned from other threads on this site that WIX filters work good on our Mini's. They carry Pro Tec filters by WIX for $1.73 each. (As well as others for more $$) I also bought the air filter Pro Tec by WIX for $3.78 each. Their shipping rate is $14.99 flat rate. I bought about 25 different oil filters and 6 air filters (about 1.5 years worth for my Mini, car, wifes car, and truck) and they just charged the $14.99 for shipping. I figure you have to buy in bulk to make up for the shipping rates to make it worth your while. Not all the filters I use were sold on this site for less though. So I just ordered the ones that were. Just thought I would pass the info along in case any body might need it.
