Commerce Discount Sale Price

Module basically implements the same functionality as Commerce Sale Price via same fields (for easier transition between modules) but in a way that fully supports Commerce Discount module. Sale Price is implemented as discount so you can make other discounts compatible or incompatible with it.

It also provides "Percentage Exclusive" discount offer for orders to let you give percentage discounts only for the amount of products that don't have sale price enabled (already discounted products).
Unlike standard "Percentage" offer it could be limited not to exceed certain amount (ie 5% discount but not more that 30$).