Hi There!
Thank you for reaching out to us. We appreciate your interest in knowing why model #: SM-R190NZWAXAR is more expensive than model #: SM - R190NZSAXAR. To answer your question, they have the same price as BestBuy; the only difference is the color.
For your reference, you may visit our website to purchase the Galaxy Buds Pro and check for available promotions; however, there are only three colors available, Phantom Black, Phantom Silver, and Violet: https://www.samsung.com/us/mobile/audio/headphones/galaxy-buds-pro-phantom-silver-sm-r190nzsaxar/.
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference #: 1144250679
Have a great day.
Melardo