Swanson's is having a buy one get one free sale on a supplement called Fibro Essentials. It includes B1, B2, B3, B5, and choline (no B6, biotin, or folate though). Among a few other ingredients including a low dose of magnesium, TMG, and methione it also has malic acid. Malic acid is important for the Krebs Cycle and ATP. Malic acid can also help with muscle pain which is why it's being marketed to people with fibromyalgia.
http://www.swansonvitamins.com/swanson-condition-specific-formulas-fibro-essentials-90-caps
Swanson's is also having free shipping on orders $50 or more until April 30th. They also have other buy one get one free offers and items on sale. You can click the tabs at the top of the screen. The tab for the ones on sale is "Online Specials". The tab for buy one get one free is obvious. There's a promo code (SAVEATSHP) for 10% off until April 30th. If that's expired (after the 30th) there is also a promo code (DPDWEB) that includes additional items on sale and BOGOs otherwise unavailable. This lasts until May 15th. To use the code you need to go to your shopping cart and enter the code and then click on the sale tabs to see the additional offers. You can also sign up for their mailing list for promo codes or check retailmenot. If you're a first time customer you can click this link to sign up and you'll get a $5 off coupon.
http://www.swansonvitamins.com/referral/friend.html?id=c8aa721b-961f-48b9-bba7-ccd231db0f9e
I'm not sure how it works, but I think it's in the form of coupon/gift certificate which means you can use it on the same order that you use also use a promo code.
There's also some multi dose multi vitamins that can serve as a low dose b complex (as the Thorne multi I mentioned above).
This first one is called 2 per day, but it's kind of confusing because the values are for 2 tablets or 4 capsules. It only has folinic acid/calcium folinate.
http://www.integratedhealth.com/vitamin-formulas/multi-two-60-tabs.html
This one is similar to the first one except it has less copper and zinc and also less b vitamins (although some are only coenzymated which might be preferable even if the dose is lower). It also only has folinic acid/calcium folinate. There are several other differences between the two.
http://www.integratedhealth.com/hpdspec/mini-multi.html
This is similar to the first two except it has a combination of folinic acid/calcium folinate and methylfolate (66 mcg methylfolate/133 mcg folinic acid per capsule). It also has a higher amount of coenzymated B vitamins than the first two.
http://www.integratedhealth.com/hpdspec/mighty.html
This last one is for anyone who wants a very low dose of everything. The values seem quite low, but B1, B2, and B6 are in coenzymated forms and it's chewable so it can be taken sublingually to increase absorption.
http://www.integratedhealth.com/vitamin-formulas/kids-mighty-multi-chewable.html
Since it's chewable that means it also has xylitol and mannitol which might be undesired. I'm taking it now. It doesn't taste terrible, but it's still kind of gross because it takes a long time to dissolve and I think I might be sensitive to the xylitol/mannitol.