How much Edge costs, that depends on what you will use it for.
If you will use Edge to make web proxies, then we offer it to you free of charge. If you will use Edge to make edit proxies from camera files, then the cost will depend on the formats and volumes.
In either case, if you are interested in using Edge, you can send us an email to support@limecraft.com and we'll get someone from the team to contact you to discuss the possibilities.