DIY is another option. Same job, same desiccant, fraction of the cost.
Found a suitable plastic jar at a $2 shop (had glitter in it). Made holes in its bottom. Perforated a self-locking plastic bag and filled it with the desiccant - got the desiccant from Ebay, very inexpensive for 1/2kg or 1kg. Closed jar and popped into the back of the scope. Made several of these to fit in my various scopes and a few that sit in scope cases. All up cost me less than one single FarPoint plug for ALL my scopes and cases!
The last pic shows the indicating silica gel, blue being all ready to go, pink saturated with water. Easy to recharge in an oven.