I would consider a subscription as well. I have never been interested in a subscription in VGHD because I am a lot more picky about their costumes. But this is not such as issue for DB.
There are 142 cards. So if you start a subscription with no cards, you would have the whole DB collection after 36 weeks.
A 6 month subscription would be value for money as long as you currently have less than 38 cards.
So it seems to me that a subscrption is possible.
I suspect that a subscription would be popular with DB. Since there are no special offers, a sub would be the best way to get the cards cheaper.