Yes, option to convert cash to Bin Points is possible and it is quite more beneficial option as it runs on 50% discounted price. The ratio of Cash Conversion is 1: 25 i.e. USD $1.00 can be converted to 25 Bin Points (i.e. 1 Bin Point = USD $0.04)
The option to Convert Cash is available to logged-in user only. This link is available almost on all pages at the top of every page.
This link will be visible only when your account cash balance crosses the limit of USD $1.00, as minimum amount that can be converted to Bin Points is USD $1.00. You can convert cash in the multiple of USD $1.00 only
At present, the reverse conversion, i.e. Bin Points to Cash is not available..