Hello,
The HikaShop team do not provide quote in the forum.
In general, the team do not do a lot of custom development ; but it can happen.
You can use the "contact us" form to send a private query to the team ; but the best would be to contact some of the HikaShop partners specialized in plugin development.
I really don't know what partners you have contacted but I'm more than surprise by the quote you got and for the most I know for some of the first listed partners, they haven't been contacted for the development of that plugin.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.