well dunno about refills but you can find some good kicks in the samples of artists like thrillseekers or headstrong, you can find them on the net... but every sample, good or bad, needs a lot of tweaking so as palm said you can use the standard kicks, maybe researching some tutorials for techniques (great ones on this forum) if you already havent...

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www.eastboundmusic.com

forget about refills and load individual samples in to redrum.

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https://soundcloud.com/ghostea stuff

Vengeance Clubs Sounds Vol. 1 & 2 thats all im gonna say , its a must have for reason users . i swear by it. it's the best thing ive tried. theres tons of kicks over a 100 on each. vol 1 & 2 . plus snares hihats you name it , Fx . Loops . this will increase you sound big time. i personally hate the kicks in reason the only thig i like is the percussion they have. oh yeah its all in wav so its easy to load with th redrum or one of the samplers . trust me spend the money you will be glad you did.

oh yeah , the best part about it , is that most of the kicks don't need much eq if any, the sound quality is great. plus, they have pretty much every style for 4/4