I was just in-store and looked for it on Friday in CP: not there. However, I make the Chef John/Food Wishes recipe for meatball sauce and it's spot-on. (I use the IKEA meatballs instead of making my own like he does.)
https://www.youtube.com/watch?v=55MIeoPaBC4

Give them a call: 1 888 888 4532

I haven't been able to find the sauce packets. however, IKEA has posted the meatball gravy recipe to their website and it's surprisingly easy.

https://www.ikea.com/jp/en/stores/restaurant/meatball-recipe-pub2252cf10

"5. Iconic Swedish cream sauce: Melt 40g of butter in a pan. Whisk in 40g of plain flour and stir for 2 mins. Add 300ml of bouillon (or consommé) and continue to stir. Add 150ml double cream, 2 tsp of soy sauce and 1 tsp of (Dijon) mustard. Bring it to simmer and allow sauce to thicken."

This is probably a longshot, but I was at IKEA in college park in December and was told they did not have gravy packets for meatballs because they were changing their supplier. Does anyone know if the gravy packets are back in stock in any of the stores? And is there any way to get them without having to go to the store?