What an idiot. Why even say anything? How is he going to take your son on vacation but need a $3 bottle of sunscreen? Did he ask for an allowance for fun activities, too?

And you KNOW that if/ when you don't send it, you're just mean ol' mom who doesn't care about her son. Eyeroll. Maybe the vampires just plan to sit under an umbrella the whole time..

If he says anything just laugh or say you spent the money you were going to use for sunscreen for gas money instead-then laugh 

a bunch of coupons for sunscreen.  I went out and bought industrial strength sunblock for Chef's paler than pale three ferals.  This was before I was disengaged.   They vehemently objected and half the time Chef couldn't be bothered to put it on so they would come back with mild sunburn ( they tended to stay indoors anyway) and the Girhippo would have a fit

My ex refused to buy dog food for his house in the beginning.  The agreement was for my girls to have their dog with where ever they were but he thought that the dog food for his house should come out of child support he paid me.  Idiot.  Dog and I enjoyed our child free weekends.  When I wouldn't cave he got a new puppy.  What ever dude.  

Yeah if he asks just say

" omg been so busy what with driving to meet you and packing and such. I completely spaced. To son: so sorry honey make sure you guys get some when there."

Do not buy the sunscreen!

If my dh was taking skids to resort I would make sure he bought the sunscreen. Would not ask BM for it.

Specialty Clothes(boyscout uniforms etc.) and haircuts for the skids however have to be handled by BM per CO.(both skids have everything they need at our house anyway)

I don't know. An increased risk of skin cancer vs being annoyed by my ex... I'd buy the sunscreen. My child's health wouldn't be worth the petty argument. 

Why, they expect to use the sunscreen they're certain you will buy!!!

What an arsehole.

Yep - no sunscreen comes from your house.  Kid isn't going to get skin cancer from dad's ill planned trip.

True story - when the Things were in 4th grade, they needed a protractor for some homework that they had to do at Asshat's house.  I had one at my house from the days when DD27 was in 4th grade, but that particular skill had been introduced that Friday at school and Money-Ka picked them up from school on Fridays, so there was no chance for them to take it with them.

I got a phone call from a crying Thing2 asking if I was going to be home so that he could come and get the protractor.  I said that I was, but it was probably more efficient to just go to the drug store right near their house.  Thing2 said "dad said he won't buy one because he pays child support."

Asshat mothereffer wouldn't spend $1 (literally, they cost a dollar back then) and drove Thing2 to my house to get the damn protractor.  I told Thing2 to just keep it over at Asshat's and I would buy a new one for the house.

Seriously, WTF is it with these idiot, asshat fathers???

As a person who had had all three types of skin cancer, I would send the sun screen with the child automatically. Yes, it's aggravating that the ex isn't buying it, but if he's asking he might have BS use it. I'd be afraid he'd deliberately not get BS sunscreen, so BS would get burned, and he could blame it on you. 

I think I would fight fire with fire on this one. He wants to be a demanding and controlling dick? It's ON!! I would take a bottle of sunscreen and individually portion it into about 35 applications. Send a timeline of when each portion should be applied along with a diagram of the boy with arrows pointing to the appropriate areas in need of protection.

If the man can't buy a stinking bottle of sunscreen, obviously he's too stupid to use it without detailed instructions. Call every 1.5 hours to ensure he has followed directions. Muahahahahaha!