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Translucent Mini 3.75x2.25 inch envelopes.
Remember that these are under the US postal service's minimum size. These envelopes are great for the small magnet size if you are handing the magnet out, or, including the magnet/envelope in with a larger card.
Quantity & Cost	Shipping	Quantity & Cost	Shipping
50 for $11.00	$3.00	200 for $20.00	$5.00
100 for $15.00	$3.75	250 for $22.00	$5.75
150 for $18.00	$4.25	300 for $24.00	$6.50
Translucent 5x3.5 inch envelopes.
These are a fun addition for 4x3.5 inch magnet favors. I do not recommend that you try to mail these out.
Quantity & Cost	Shipping	Quantity & Cost	Shipping
50 for $22.00	$3.50	200 for $55.00	$6.50
100 for $34.00	$4.25	250 for $65.00	$7.50
150 for $45.00	$5.50	300 for $75.00	$8.50
Clear 5.7x4.3 inch envelopes.
These envelopes have a peel off strip on a small flap which seals it. I do not recommend that you try to mail these out. These envelopes are a great addition for those ordering the 5.5x4.25 inch magnet size as a favor.
Quantity & Cost	Shipping	Quantity & Cost	Shipping
50 for $20.00	$3.50	200 for $50.00	$6.75
100 for $30.00	$4.50	250 for $60.00	$7.75
150 for $40.00	$5.75	300 for $70.00	$8.75
Pricing is in USD, and shipping costs listed here are only valid for US addresses. Shipping outside the US is entirely possible.

More envelope sizes are available: 5.25x7.25, 4.75x6.5, 4.2x9.5, 5.75x8.75....