One odd thing about this is that the rebate proclaims it that it "Features 8 MB CACHE!!" whereas the model number and CompUSA page say it's a "BB" model aka 2mb cache. Considering that WD doesn't make 175GB drives and this is obviously a promo for a 180GB model (folks can't price match if you call it a 175GB drive), it's up to conjecture that because of this promo you might get a 8mb cache drive.
If you don't get a 8mb cache drive, you can always complain to CompUSA (or CompUSSR as I call them ) as it's a discrepancy in advertising.
You can find the drive here: http://www.compusa.com/products/product_info.asp?product_code=301996&pfp=home&cm_vn=cusa_4_22_03&cm_cat=Upgrades&cm_pla=hpf3&cm_ite=301996#checkstore
It's $129.99 after rebate if you buy in store and $99.99 after rebate if you buy online. Shipping (ground) and tax will hit you up for about $20.