What can I buy with COL$16,650

You can buy one of the following:

Prom ticket
Ticket to a BBC Proms classical music concert, standing for £5 (COL$14,590) from source
Lip Gloss Designed By Me
Arts and craft for £5 (COL$14,590) from hawkin
Shake N Shine
Gifts for £5 (COL$14,590) from hawkin
Make Your Own Friendship Bracelets
Arts and craft for £5 (COL$14,590) from hawkin
Heart Mini Hot Water Bottle
Gifts for £5 (COL$14,590) from hawkin