Product review (5 stars): Whirlpool/Maytag/Kenmore (and others) Dryer Blower Wheel
This was a perfect fit for my 1990's era Kenmore gas dryer.  The hardest part of the repair was removing the old blower wheel as it had cracked and the plastic was freely spinning around the knurled nut which is embedded into the part during the plastic injection molding process.  The price was one of the lower ones I found for this particular part.  It arrived on the expected date and was installed 30 minutes later.  Haven't had a bit of trouble with it in the intervening three months.  FYI, a lot of folks don't understand that most appliances sold in the US are made by one of two or three manufacturers.  That creates commonality in basic design and underlying parts.  This means a blower wheel or gas burner for a Whirlpool appliance also works with other makes such as Maytag (owned by Whirlpool), Kenmore (made for Sears by Whirlpool) Amana, etc.  When I need a part, I find the part number from Support or Parts section of the appliance's web site.  There's usually a zoom-able parts diagram indexed to the parts list list.  I then search for the manufacturer's part number on Google or Amazon.  E-bay can sometimes be a source of new parts--though I'd be careful of what used parts you buy there--non-critical, inexpensive used items like knobs or handles which are either unobtainable or prohibitively expensive when new are probably safe.  .Once you've found your part, and there will be several different prices, shipping costs, and shipping times, the issue is selecting the purchase price, delivery cost, and delivery time best suited for your situation.