Rav Alashvili justifies his psak by claiming that the merchants jack the prices of chickens up making it unreasonably expensive. He points to the Shulchan Aruch that says that when the merchants jack up the prices of fish, people should not buy fish for shabbos.
With the cost of a chicken being supposedly in the range of 50 NIS each, it gives another good reason to use money instead of chickens - there is no specific sum necessary, and the money goes to tzedaka. Even if you say you must use the amount of money to cover the cost of a meal, by Purim I have heard rabbonim say that value is in the range of 10-15 NIS - i.e. the cost of a falafel.
If you are still going to use chickens and the cost is too great, you can now consider using one..
(source: Ladaat)
------------------------------------------------------ Reach thousands of readers with your ad by advertising on Life in Israel ------------------------------------------------------