Collinite IW and 476S, awesome quality wax in both looks and durability for the $$$
Duragloss 105, such an awesome sealant for only 10.00!
Eurow Sheepskin mitts, only 5.00 and will last an entire season
AA Foam, about 2.80 at walmart and has multiple uses
as others have said Megs APC (esp when diluted)
Clay Magic Blue, Autozone has it for 10.99 with lube
Ultima PGP, when used as directed costs so little per application, I've done 6 applications and my 4oz bottle is more than 3/4 full!
Optimum has many products that are cost effective, I've used the car wash soap, ONR, polishes, tire shine and the protectant plus, and the Opti-seal looks like my next sealant purchase.