$19.99 for Blu, $19.96 for DVD. Best Buy can still price match in-store next week (same for online if you call in); they have it listed for $29.99 Blu, $24.99 DVD.
Also, Season 1 is also $19.99 for Blu, $16.99 for DVD at Best Buy. Comparison: The lowest Orphan Black on DVD went at Best Buy was $15 for Season 1.
Update: Season 2 WILL be on sale during release week at Best Buy for $20 for Blu and $17 for DVD. Thanks to PapaSlaughter for pointing it out. But let's get those Amazon price matches rolling out starting on Sunday, eh?
Update 2: Season 1 is no longer discounted at Best Buy as of Saturday, the 12th (usually sales tend to last till end of Saturday...). Season 2 is being offered as of 2PM EST for the discounted prices above, however. Likely an oversight on Best Buy's part, but you have a chance to pre-order NOW.