Win boosting is priced per win, so you order a set number of competitive victories rather than a fixed tier. That makes the figure track the games you ask for, not the distance between two ranks. Set the win count on the Overwatch win boost page, or aim for a defined tier instead with rank boosting.
For a rough anchor before the live widget settles it: a single competitive win in the lower tiers sits in the low single digits, a short run of wins reaches the mid double digits, and wins requested near the top of the ladder cost more per game because the win rate a booster can hold tightens. If you want a structured per-game route instead of a count, the pay per game option sits close by.
Use the grid below as a yardstick for the figures the live widget returns, handy for checking that an order looks fair before you commit. The win boost page reads your exact rank, role and win count, so it stays the source of truth.
USD bands for orientation only. Each order is priced from your live rank, role and win count, so the widget on the win boost page settles any difference. Switch to the pay per game view if a per-match route suits the goal better.