Buckeye is rarely sold for knife handles unstabilized, so I assume you bought some larger blocks of unstabilized buckeye burl often used by wood turners.
Cut them into slightly oversized knife handle blocks and send them to K&G or WSSI and have them stabilized. Do not cut them into scales. Do that from the blocks after stabilization.
You can make a long block that will cut out several sets of scales and have it stabilized, and then slice up the block like a loaf of bread. If you like scales that are 1.5X4". Cut the block 1.75X4.25 by any length up to 12". After having it stabilized, trim about 1/8" off the four sides ( don't worry about the top and bottom), and cut sets of scales of the end as you need them. If you cut more than one set of scales, make sure you flip each pair of scales over to bookmatch them ( turn the adjacent cuts the outside so both are identical) and rubber band them together as you cut them off. Mismatched buckeye scales will still be nice, but bookmatched buckeye is often stunning.
If the block you have is thick, make sure you decide which face you like for the handle sides before slicing it into slabs. Also, remember that you will pay to stabilize whatever you send, not what you finally cut out to keep, so trim any bad wood or overly excessive thickness before sending it out. $10/pound is a lot of money to toss in the trash can needlessly.
Final comment - It is better to waste a little wood and get four or five great handles than to try and make the most of a block and get seven or eight so-so handles.