1502467:I spent 10 dollars on cards 2 weeks ago and got a spectral tiger loot. It's all just up to luck.
I think a bit of explanation is deserved here.
Because he might spend 20 or 30 bucks and decide to keep buying because someone said "they spent ten dollars and got one..." Which is so ridiculously unlikely.
It's believed that in a full case of booster boxes (a case has 12 boxes, and a booster box has 24 packs) there should only be one or two spectral tigers. But likely only one. So assuming you buy one pack you have around a 1/288 chance.
But if you want to take a chance spending a hundred bucks on boosters I would definitely buy boxes. Which I think a box of Fires of Outland (the set that Spec Tiger comes from) sells for around that. As for the chicken, (I think this is a little more common maybe 4 per case) you can get from Fields of Honor, and I think you can get two booster boxes for around that.
I know you said you won't ebay one, but I would always say you should just ebay it unless you plan on buying a full case and then sell everything else you open.
-David G