The Lowe's near me sells "Gold Seal" or "Ideal" clamps either separately,or you can buy "contractor packs" in bulk bags for less--they usually have one or the other brand,not "both" sometimes some in the bins are mixed together--they have the small #4 ones used on fuel lines all the way up to huge ones ,ranging up to a foot or more,even have one super long size thats about 3 feet long!..
The hose clamps I often need that are hard to find for small engines like weed whackers that use 1/8" to 3/16" fuel line are hard to find,and expensive when you do find them,and they are the sucky "pinch" type--so far Lowes has them in an "assortment" blister pack,but I hate paying 5 bucks for 4 different sizes,when I need TWO the same size...motorcycle shops sell them separately for 4 bucks each,and you have to drive 5 miles and hope they have some...
I've resorted to using Tygon fuel line instead,which needs no clamps on low or no pressure applications..thats not easy or cheap to find locally either though..
I used some on my 6.2's fuel return lines that failed about 6 months ago and it works slick,no dinky clamps to get frustrated at,they suck to get at!..