On the Backpack.tf classifieds of this taunt, most prices range from the lowest (15-18 keys) to the medium range (20-23 keys) depending on the trader. Quick-selling is set to be around 10 Keys but someone could try their luck for 12 Keys.

On the Marketplace.tf, a Screaming Tiger Square Dance is on the market with the lowest amount being sold for $38,89, which is worth approximatively 23 keys. Though, I don't think this will sell fast because of 20 Keys being the balanced price for this taunt. Someone will buy it eventually, just not fast enough for anyone to care about that extra 3 Keys.

On the Steam Marketplace, the lowest amount for a Screaming Tiger Square Dance is worth $45 (or 27.46 Keys) and the Highest is worth $63.58 (or 38.74 Keys). Last time I checked the Steam price, the highest amount was there since my last visit and it hasn't been sold yet. Meaning the 38.74 Keys is way too high while the 27.46 Keys offer could entice some people to buy it, but it still feels a little bit too expensive.

In conclusion, the price for this taunt and effect should range between 18 and 23 Keys, or lower, depending on the demand. As it stands, 70-100 Keys is too high for this taunt and it is outdated; It provides false information to the backpack worth and a false sense of you having an expensive item. Lowering the classified price would remedy this and help people sell this taunt at the correct price. The effect is amazing but it doesn't fit the dance, so I wouldn't put it as a high-demand taunt & effect in the first place. I could not find recent trades in Bazaar or TF2Outpost, most of them were a year old or so, though I hope these evidence I provided are significant enough to have merits.