Creative Market is an online marketplace for handcrafted design content from independent artists and designers. On CM you can buy digital goods which you can use in your personal and commercial projects. Have a look at my profile, a link to my shop is here:
At Redbubble you can buy a lot of different products with my artwork on it, from prints to laptop covers, from stickers to tote bags. Unfortunately my Redbubble profile is rarely up to date - if you'd like to buy a product of a certain image and it's not there, please let me know.
Each design project is unique and quotes are given on a job to job basis, taking into account the size of the client, use of the artwork, complexity of the job etc.
The following is just a guideline to give you an idea of the average price for an exclusively licensed custom drawing:
・ small spot illustration: $50-$75 / €45-€70
・ medium sized illustration: $150 / €135
・ full page (e.g. city illustration, seamless patterns): $300 / €270
・ full page with a lot of small details: $450-$550 / €400-€485
I charge less for non-exclusive licenses, it largely depends on the artwork itself and how useful it will be to other customers and clients.
Changes to existing images cost on average $25-$50 / €20-€45.