Sorry to hear!
OEM coil is always your best bet, especially for what it takes to replace them, sadly... the price is crazy/stupid!
With the ebay coils... they're pretty much "hit and miss" for a good, long lasting one! (it's kinda a "you get what you pay for" type thing!)
If you decide to go with OEM, check with David at Revolution Golf Cars, (a fine BGW sponsor)
It isn't listed on his website, but see what he can do for you!
http://www.revolutiongolfcars.com/