This varies on the person. Since this is a larger MG, expect it to take much longer than usual.

Sadly no there isn't there's either standard shipping or free shipping. Free shipping comes when you pay over 100 bucks which this kit alone will get you. But sadly no express shipping I will say though that they're very punctual on delivery and on more than one occasion I have even gotten my kits early.

Yes, along with a small sheet of color correcting stickers.

Action base 1 is strong enough to hold the Sazabi Ver Ka and will take the included action base connector. You may have to try the base in different configurations to keep the center of mass from tipping it over, but it does work.

this has the new blue logo

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Has both

Delpi Decal has a set of metal stickers that works for this kit. https://newtype.us/p/wqfV0l1MvWm4ucMwyAp4/h/delpi-decal-rg-sazabi-metal-sticker-gold

It's hard to predict Bandai's restock schedule as they don't really announce anything except for new releases, especially now with the goings-on in the world affecting manufacturing, supply chains, and distribution; but the good news is this kit is very popular and seems to be reprinted more than average for MGs, almost to the same level as lead Gundams, so it'll be around sooner or later, maybe even multiple times before the year's over if we're lucky. I'm also guessing that with Char's relevance in Gquuuuuux, we're going to be getting a lot more reprints of his mobile suits.

Bandai has a separate item listing for a two-unit set.