Add Price tags to entries with sort functionality

See attached image, site is [login to view URL] ; functionality should be like on [login to view URL] currently we are using the price by having second category. I don't think that's right. This should probably have a special field. Also, price can be "1 million" "1 billion" or "1,000" but that sort by price functionality should still work (I will only use words million or billion when price is more than $999,999) so you may have to code for those two words. Anything less than $999,999 will be in numbers.