I requested a ring sizer from Blue Nile recently and got the following offer:

Save on Wedding Bands:

* Save $15 on each band under $250

* Save $25 on each band over $250

* Save $50 on each band over $500

* Save $100 on each band over $1000

You must enter SIZER46 in the Reference Code Box or mention it directly to customer service at the time of check out. Offer cannot be applied retroactively or combined with other offers and applies to U.S. customers only. Offer is limited to the purchase of (one or a paire of) Women's and/or Men's Diamond or Wedding Bands. Offer subject to change at any time.