D20 Cyberscape, from WotC, has rules for Golemtech, Bone Runes, Necrotic Implants, and such (with Golemtech just being a magical variant of the standard cybernetics rules for D20 Future/D20 Cyberscape). However, it's oriented more towards D20 Future and Urban Arcana, so there are no gold piece price equivalents listed. Really unfortunate, that.
You could ad-hoc the prices somewhat, though, without too much trouble maybe. The Gamemastering chapter in D20 Modern has a table of Purchase DCs and their dollar equivalents. A suit of leather armor in D20M has a PDC of 12, equivalent to 200$. In D&D it's 10 gold pieces for a suit of leather armor. Leather armor can't be all that hard to make and acquire in the modern day, nor in D&D, so it should be a decent conversion comparison. Unlike full plate armor, which may be more complicated nowadays since armorsmithing isn't a very common skill these days, but leatherworking is still reasonably common enough. Weapons are unlikely to be good for comparison purposes, since they can be more easily mass-produced nowadays and so their PDC in D20M is probably skewed.
So, you might check the PDC of a cybernetic implant in D20 Cyberscape and then check the PDC-USD conversion table in D20 Modern, figure out the dollar value, and then convert that amount to D&D gold pieces. $200 in D20M/F would be equivalent to 10gp, so $20=1gp and thus $1 = 5 copper pieces. So, a Purchase DC 36 bit of cybernetics, worth $200,000, would be worth 10,000 gold pieces ($200 x 1,000 = 10gp x 1,000). This may or may not be quite fair depending on how much wealth/treasure ya give PCs in your D&D campaign, but it's at least a decent start on a conversion.
D20 Cyberscape doesn't include reprints of the cybernetic implants/replacements from D20 Future, but the Future SRD is available for free perusal at the
www.wizards.com website.
