wholesale cheap hotel key card sleeves Guardian Holder Sleeves, Pack of 500 Small Envelopes for Key Cards, Gift Cards, Credit Cards, and More, 2 ⅜ Inches x 3 ½ Inches, Black : Office Products 3/8 x 3 500 Pack Hotel Key Card

For US prices, Star City Games is pretty popular, and as a mass reseller indexing site, I see TCGPlayer used a lot for pricing

Mobius the Frost Monarch When old school Yu-Gi-Oh players think of Monarchs, its this guy who comes to mind

They are also relatively cheap to cast and have been staples in many MTG decks for years

Odd-Eyes Pendulum Dragon X DARK Level 7 [ Dragon / PendulumEffect ] ATK 2500 DEF 2000 P Scale 4 You can reduce the battle damage you take from an attack involving a Pendulum Monster you control to 0

Moreover, 1500 is a cheaper cost than both Solemn Warning, Solemn Authority, and Solemn Judgment (in most cases)