Help!!!

So my almost 4 month old is beginning to teeth. I went to Walgreens and CVS to get all natural teething tablets and I also tried another type of teething liquid and at both stores with both products it told the cashier that they couldn't sell.  They said that they get had to take it off the shelves it had been discontinued.  Anyone else had this problem?   And what is another good product to try besides oragel?