I own 2 air cleaners, why never no coupons on these machines?

I'm thinking about replacing these Honeywell air purifiers with Orecks because they need no filters. I never see any coupon offers on the Honeywell purifiers,why?I own 2 air cleaners, why never no coupons on these machines?
It's hard to find coupons for specific products. It you want to get the best prices, you can first check a comparison shopping site:





http://www.nextag.com/


http://www.pricegrabber.com/





Then check an online coupon site to see if the store with the best price has a coupon code:





http://www.couponheaven.com/


http://www.flamingoworld.com/index.htm





You might find that the comparison shopping sites will show both well-know (reputable) stores and little-known stores. I usually go with a better-known store, even if I have to pay a bit more.I own 2 air cleaners, why never no coupons on these machines?
I did not took it off,go to shopkeeper and check with him,and coagulation in adavance, you want to change them.