Can anyone tell me where every bastard sword is in BG2:SoA and BG2:ToB and how to get them? My source on weapon locations has very few bastard swords listed.
Also, is there a version of ShadowDaemon's Bastard Sword mod for BG1 as well as BG2?

Download Simpson's walkthrough and then make a search in it for "bastard" and write out all the locations.

As for the mod, it's only for BG2 as far as I know.

Bastard Sword - general item, found most places, ogre mages and the like.
B-Sword +1 - again, found in several areas, most shops. The cambion in Chapter 1.
B-Sword +2 - some shops and creatures.
Kondar +1 (+3) - From Hendak in the Copper coronet - +3 against shapeshifter IIRC.
Jhor the Bleeder +2 - underdark, the machine thing.
Blade of Searing +3 - Ust Natha Tavern.

ToB

B-Sword +3 - General Shops and some creatures
Foebane +3/5 - can be upgraded by Cespanar, found in Watchers keep, upgraded with Fflars scarbbard in Saraduch Castle.
Purifier +4/5 - Watchers keep lvl 3 also upgradable with the eye of Tyr in Sendais' enclave, on the lich.

Where can I find Simpson's guide? Also I know the BS+2 is in special stock in the Adventurer's mart but is it anywhere else?

http://www.sorcerers.net/Games/BG2/index.htm

"Complete Baldur's Gate II & Throne of Bhaal FAQ and Walkthrough"

Thank you Taluntain I appreciate that :)