If you’re in the states order Berger’s BM7 from A.M. Leonard when they have a free shipping promo. Get on their email list. Crazy but I got a 3 cu. ft. bag recently for $19 and I see the price has jacked up to $63. WTF?
When it comes to seed germination mix, I don’t over think this, don’t use any special stuff, no need to. Just have some clean, sanitized soil without any big chunks of pine bark fines/mulch and let 'er rip. Sow your seeds no more than 1/2" deep, firm the soil over them with your finger. This aids in the cap coming off.
UB