B&H has what looks like the entire range of Vello battery grips for DSLR and mirrorless cameras on sale today with prices starting at $29.95. I previously reviewed the Vello Battery Grip for the Canon 5D Mark II and 7D. These are great grips for the price you pay and the performance they deliver. You can find all the deals here on the B&H Deal Zone page.
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When/if Vello, etc. is going to make a battery grips for cameras such as Nikon P900, Lumix zs200. I know it is probably costly, but so are these cameras which are good(?) alternatives to DSLRs.