here's a help how to fill slopes best in:
https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSoe2g-3pNrmM_ZjhFGVrPLB70hHQAZ3XcooY4t0lAJv5D7Vg1Lrg
important to know: the cover doesn't have to be completely closed, one has only to take care, that once they fix the cover with the kragle stripes no part can fall out
and: You can also buy the refill boxes if you ask the storemanager. You have to pay the same price as for 6 large cups. I have a box full of the 2x2 tiles in light bluish grey and i put them into 6 large cups and every cup without the cover was more than full, so it makes sense with parts you need quite frequently and you don't have to spend hours at the store.
there are some www pages where you find the info on what and how much is available in the stores. these are never up to date by no means. if you need a special part, you can ask me per PM, maybe I know.
In our forum you find from time to time recent updates of interesting bricks here: http://forum.lgoe.at/index.php?board=2.0 among the locked top threads
normally the wall is filled for little boys to make cars. Thus you find steering whells, wheels and tyres. And for little girls, thus you find transcolored pieces like diamonds, pieces in friends-colors, windows, doors and fences to build small colorful houses. For true MOCers like us there is only little space.
Translation/Pokus o preklad (je tam par zaujimavych info, ak by bolo nieco zle alebo nepochopene, kludne ma opravte):
Ako najlepsie naplnat slopes:
https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSoe2g-3pNrmM_ZjhFGVrPLB70hHQAZ3XcooY4t0lAJv5D7Vg1Lrginfo: pohar nemusi byt uplne uzavrety, akurat je treba dat pozor, aby nevypadavali ziadne dieliky
a: je mozne zakupit krabice (boxes), treba sa opytat veduceho predajne. Stoji to tolko ako 6 velkych poharov. Ja mam box plny 2x2 LBG tiles a ked som ich dal do 6 poharov (bez vrchnakov) tak boli naplnene kopcovito, cize to dava zmysel pri dieloch, ktorrych je potreba vela a nechce sa vam stravit hodiny v obchode.
existuje niekolko www stranok kde je mozne najst info o tom, co je dostupne v obchodoch, ale nie su velmi aktualne. ak niekto potrebuje nejaky specialny diel, opytajte sa herb66 cez postu, mozno bude vediet.
Na ich fore sa obcas objavi sprava o aktualnych stavoch zaujimavych dielov:
http://forum.lgoe.at/index.php?board=2.0 a hladat medzi vrchnymi uzamknutymi temami
standardne byva stena naplnena takymi dielmi, aby si mohli chlapci postavit auticka (kolesa a pod) alebo dievcata rozne farebne domceky (cize rozne sialene farby, napr. z friends a diely na domy ako okna, dvere, zabradlia). Pre realnych MOCerov ako my je tam toho malo.