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Not sure your location (you should ad that and the car year to your profile so we can see it)
The 6 tonne HF stands are about $50 and are fine, frequently on sale or use the coupon.
M
The flat tops on those jack stands are better when placed under the flat areas of the frame. I would buy two pair of those and one pair of the other style. Stands are not expensive.
Northern tool has an excellent selection of garage tools that are reasonably priced. Many are name brand. They currently have a pair of Hein-Werner 3-Ton Jack Stands for $75. They have some less expensive and lighter duty stands as well. Keep in mind 4, 3-ton stands can theoretically handle 24,000# and 4, 2-ton stands, 16,000#. Just about any set you have posted can do the job you're planning to do.
One thing to keep in mind when using jack stands is they like being on a flat level surface sturdy enough to support the. If you find it necessary to use them on a dirt surface, be sure to use a large enough piece of wood (2"X12") to support each of the legs at the same time. Be reasonable on the height you extend the stands and avoid pushing and shoving on the vehicle while it's up in the air. I keep a couple of 12" lengths of 8" X 8" timbers to place under the vehicle strategically (under a crossmember, frame section, differential) to capture it in the event something did fail.
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Speaking of safety, when I get my car up on the 4 stands, I go to each corner of the car and give it a firm shake. Better to fall off the stands shaking the car than being under it if a jack(s) fails.
With the others, not comfortable with smaller ones that are extended all the way up. Always have a jack under it just to eliminate Charlie Brown luck.
Walmart sells some nice ramps for $40/pr works with most low sitting cars. iF you cant drive up, then jacking the car up and setting them down on ramps seems safe (Chock tires)