For the 25th Anniversary Line, Grand Slam was included as the driver for the Target-Exclusive Night Spector, which was a olive-green repaint of the classic Joe flying submarine, the S.H.A.R.C. Since it was Target-exclusive, you either found this thing on clearance on an endcap or you didn't find it at all, I don't think there was an in-between. The three Target-exclusive vehicles (blue Cobra HISS, the Night Specter, and the A.W.E. Striker) all cheaped out, the file cards were printed on the side of the box and they did not get stands so Grand Slam is the only 25A O13 character that didn't get a stand with his name on it.
25A Grand Slam is just a straight repaint of 25A Flash. Just like the original Grand Slam, his only accessories were a helmet and visor...no weapons or any kind...so I bought an extra Flash and gave Grand Slam his XLM-1A Laser Rifle. I also had an extra Joe JUMP pack laying around, so he got one of those since the 83 version came with one, too. Like Clutch, Grand Slam wasn't really high on my interest list as a kid and I guess I gotta blame that on the fact that he was a vehicle driver as well. Also, I probably just assumed Flash was included with the HAL since he looked the same as Grand Slam and was already they team laser expert and was more awsum.