I know it has been kinda touched on already, but just want to bring it up again to reiterate it: Always call. If it is a business, always call and you will be taken a lot more seriously. A call is respected more with most, whether with a large business, small business individual, or just enthusiast selling their snakes. Further, on a phone there is alot less spam to compete with in terms of getting their attention.

Some businesses carry normal business hours, so you may have to wait for a response to a phone call until the weekdays, so if you call on friday after 6pm and leave a message, it could be monday at 5pm before you could get a response.