If you want more than 10 keys, you must have at least 20 rep on steamgifts
Paying with Paypal:
You go first with payment
Send payment as a gift (family / friends).
(if you can't send as a gift, you pay the fees.)
Include the note:
"I (Steam ID: XXXX) I am paying for a Team Fortress 2 ingame item.
I accept that this payment is not refundable; I will not use any charge back feature"
25 Keys
$1.83 PayPal each
Requirements
Paying with Paypal:
"I (Steam ID: XXXX) I am paying for a Team Fortress 2 ingame item.
I accept that this payment is not refundable; I will not use any charge back feature"
(Thanks to LuckyLastLaugh for the info box)