Get supported EC2 instance types in the current account and region. If you only need to check for specific types, then specify them in types.txt in the script directory, otherwise it will process all available instance types in the region. Tested on MacOS.

aws_ec2_get_supported_instance_types.sh

#!/usr/bin/env bash

# Get supported EC2 instance types in the current account and region. If you 
#  only need to check for specific types, then specify them in types.txt in 
#  the script directory, otherwise it will process all available instance types
#  in the region. Tested on MacOS.
# Prereqs: awscli, jq

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
TMPTYPES=/tmp/types
PREFERREDTYPES=${DIR}/types.txt
REGION=$AWS_REGION
ACCOUNTID=$(aws sts get-caller-identity --query Account --out text)
[[ -z ${ACCOUNTID} ]] && { echo "Could not determine account ID"; exit 1; }
OUTPUT=${DIR}/supported_instance_types_${ACCOUNTID}_${REGION}.txt
TIMESTAMP=$(date '+%Y-%m-%d %H:%M:%S')
echo -e "${TIMESTAMP}" > ${OUTPUT}

get_types(){
  aws ec2 describe-instance-type-offerings \
    --location-type availability-zone  \
    --filters Name=instance-type,Values=${type} \
    --region ${REGION} \
    --output text \
      > ${TMPTYPES}.${type}.txt
}

check_types(){
  if [[ $(wc -l ${TMPTYPES}.${type}.txt | awk '{print $1}') == 0 ]]
  then
    echo -e "\n${type} not supported in ANY AZ" | tee -a ${OUTPUT}
  elif [[ $(wc -l ${TMPTYPES}.${type}.txt | awk '{print $1}') < 3 ]]
  then
    echo -e "\n${type} only available in these AZs:" | tee -a ${OUTPUT}
    for l in $(cat ${TMPTYPES}.${type}.txt | awk '{print $3}')
    do echo "  ${l}" | tee -a ${OUTPUT}
    done
  fi
}

prep_types(){
  if [[ -f ${PREFERREDTYPES} ]]
  then
    echo -e "\nProcessing instance types specified in ${PREFERREDTYPES} ..." | tee -a ${OUTPUT}
    cat ${PREFERREDTYPES} > ${TMPTYPES}
  else
    echo -e "\nProcessing all available instance types ..." | tee -a ${OUTPUT}
    >${TMPTYPES}
    for t in $(aws ec2 describe-instance-types \
      --query 'InstanceTypes[].InstanceType' \
      --out text); do echo ${t} >> ${TMPTYPES}; done
  fi
}

get_az_ids(){
echo -e "\nAvailability Zone Name to ID mapping:\n" | tee -a ${OUTPUT}
  aws ec2 describe-availability-zones \
  | jq '[.AvailabilityZones[] | {"ZoneName": .ZoneName, "ZoneId":.ZoneId}]' | tee -a ${OUTPUT}
}

prep_types
LISTTYPES=$(cat ${TMPTYPES} | sort)
for type in ${LISTTYPES};
do
  get_types && check_types
  rm -f ${TMPTYPES}.${type}.txt
done

get_az_ids
echo -e "\nOutput: ${OUTPUT}\n"