The Avia Charge? No they do not (it is only available online from those two sources as far as I know)...
Dehydration is a real danger here and if your bird is dehydrated you will need an electrolyte mix. Look for an electrolyte/vit mix at the feed store...they may have a brand called duravet....You can also give three drops of Polyvisol enfamil (this is childrens liquid vitamins) ...it will not hurt and may help. (once a day for a week then taper off the next) In addition to that,you can also give the chickie a human vitE gel tab. (There is a combination one with selenium...try to get this as vitE uptake is also dependent on selenium.... make sure the selenium content of each pill is no more than 50 MICROgrams>this is very important) >p r ick a hole in the tab and squeeze out the contents and give into beak a bit at a time. give one geltab ( in total) a day for two days then once every two days three times and see if that helps. ( VitE/selenium is helpful with most all neurological symptoms and toxicoses.)
You MUST ensure it drinks enough...I can not stress this enough as dehydration will kill your bird quicker than what ails it.
This symptom is very scary I know but I know of many ppl that have got their birds through it.... if a bad case of botulism there is no cure...you just have to cross your fingers and wait it out and ensure it does not die from dehydration before it can get beter.
Because it is not eating enough is why I suggested the Avia Charge (which is a complete daily supplement which can be added to their feed or waterer to concentrate the nutrition) however you can also go to a pet store and get baby parrot handfeeding "formula">this is a powder you can mix with water to a thick or thin consistency and can mix in with the feed or feed on its own a wee bit at a time in the beak. When giving water or feed you must ensure it swallows it on its own (so dont overfill the beak with food or water as it will aspirate into lungs if you do this).
If you find it difficult to do the feed and vitamins direct into beak you can also take a wee bit of plain white bread and let it soak up the vitamins and handformula and give wee bits of that into beak...cup the neck in your hand gently (after he ahs settled down in your hand on your lap) and gently stroke underneath the neck to encourage to swallow.