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You only covered the bolus requirements.

You also need a basal insulin for Type-1 diabetes (unless you're on an insulin pump, which is an entirely different class of expense), so something like Tresiba ($505) (https://www.goodrx.com/tresiba) or Lantus ($357).

Still not $1300/mo, but your price is also using temporary rebates and coupons, which certainly aren't always available.

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https://www.goodrx.com/basaglar

$250 for five 3ml at 100 units/ml (1500 units total).

https://www.goodrx.com/toujeo

$324 for three 1.5mL at 300 units/ml (1350 units total).

https://www.goodrx.com/lantus

$357 for five 3ml at 100 units/ml (1500 units total).