I use an older NETHEREXE 8 bale accumulator that I bought used in 2002. Think I paid about $6K for the accumulator and bale grab. Works well, but with any accumulator that drags bales, you quickly learn to not drag a half load to another part of the field unless the distance is less than 1/4 mi. Also switched to poly twine for that reason.
I think I remember seeing that Netherexe was bought by another company, but do not remember who.
My e-mail is open.