1 The costs depend on the flavor of cheesecake. 2  Juniorscheesecake.com, an online cheesecake retailer, sells their cheesecakes for $35 to as much as $55. 3  If you are going to bake the cake yourself, Gardenweb.com claims that the average cake can cost $14 to $16 when ingredients and utilities are factored in. Purchasing a slice at a local restaurant can cost $3 to $8 per slice. 2  Four assorted individual cheesecakes by Omaha Steaks retails for $10. 3  For example, slices at a restaurant such as The Cheesecake Factory can cost $6 to $8 per slice. 4  The costs depend on the flavor of cheesecake.